WASTE HEAT RECOVERY DEVICE

• US 20130098034A1
• Filed: 04/25/2011
• Published: 04/25/2013
• Est. Priority Date: 07/08/2010
• Status: Active Grant

• Current Assignee: IHI Corporation
• Original Assignee: IHI Corporation
• Inventors: Niizuma, Motonao
• Granted Patent: US 9,109,503 B2
• Time in Patent Office: Days
• US Class Current: 60/611
• CPC Class Codes: F01N 5/02 the devices using heat
• CPC Class Codes: F01N 5/04 the devices using kinetic energy
• CPC Class Codes: F02B 33/40 of non-positive-displacement type
• CPC Class Codes: F02B 37/00 Engines characterised by provision of pumps driven at least for part of the time by exhaust
• CPC Class Codes: F02B 39/10 electric
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F04D 25/06 the pump being electrically driven F04D25/08 takes precedence
• CPC Class Codes: F05D 2220/40 in turbochargers
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

There is disclosed a waste heat recovery device including a turbine 1 driven by an exhaust gas and a compressor 8 which compresses a gas, comprising: a generator 2 which generates electric power by rotation of the turbine 1; an electric motor 7 which rotationally drives the compressor 8; and a control device 17 which drives the electric motor 7 by using the electric power generated by the generator 2 as a power source.

Claims

1. A waste heat recovery device including a turbine driven by an exhaust gas and a compressor which compresses a gas, comprising:

a generator which generates electric power by rotation of the turbine;

an electric motor which rotationally drives the compressor; and

a control device which drives the electric motor by using the electric power as a power source.

2. The waste heat recovery device according to claim 1,

wherein the control device comprises:

a rectifier which rectifies an alternate current output from the generator to convert the same into a direct current;

a smoothing circuit which smoothes a direct current voltage immediately after the rectifier;

a direct current bus which transfers the electric power from the turbine side to the compressor side;

an inverter which drives the electric motor;

a rotation speed detector which detects rotation speed of the turbine and the generator;

a voltage detector which detects a voltage of the direct current bus; and

a rotation speed command unit which outputs, to the inverter, rotation speed command value of the electric motor and the compressor which is calculated based on the rotation speed and the voltage.

3. The waste heat recovery device according to claim 1,

wherein the control device comprises:

a rectifier which rectifies and converts an alternate current output from the generator into a direct current;

a smoothing circuit which smoothes a direct current voltage immediately after the rectifier;

a direct current bus which transfers the electric power from the turbine side to the compressor side;

an inverter which drives the electric motor;

a rotation speed detector which detects the rotation speed of the turbine and the generator;

a direct current power source which supplies an electric current to the direct current bus;

a diode which supplies the electric current to the inverter, when generated voltage from the turbine and the generator is less than a voltage which enables the inverter to operate; and

a rotation speed command unit which outputs, to the inverter, rotation speed command value of the electric motor and the compressor which is calculated based on the rotation speed.

4. The waste heat recovery device according to claim 2,

wherein for a pair of the turbine and the generator, a plurality of the electric motors and the compressors are provided.

5. The waste heat recovery device according to claim 3,

wherein for a pair of the turbine and the generator, a plurality of the electric motors and the compressors are provided.